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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'adf64ad05c6277d42c3dfaf315e3dde2addf3b1fe6f9891d80a555bcb7138f20' 
  AND token = 'JoUXPds1DBwG5pspJoY2Fu6fjEeegUF2Maw63Pinxes=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00110

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}