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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a4950ce2880fc5fe21db0d3366a0b2f5c1c4fc76a4dc3ee130d63aa48a651d58' 
  AND token = 'dY1GVqWGnM3ahKAZI3V/MF8uwDtJ0Xk5aOYY1zCxjKM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00106

JSON explain

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