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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '09b753490e13622c2b0daff54e972a9799de7868647a2f8dcd0e6818dbfdc27c' 
  AND token = 'fcHbYsBrK8oxpR6Mh6+Bp4VoJg8ec44TsDq74pi5Ve8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00098

JSON explain

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