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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e87b4d933b8b466ef9755b66e65179fc967f12c5c90b07e6c3261ee916468b38' 
  AND token = 'vM7g5gX/iLN1Yq1j/cpAmsA2ufb1BCtUZ+3H0tMrpbo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00057

JSON explain

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