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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6906cb0d060bca9465275b9b941a011625f1523ab38e01b69cd640a5d116b53c' 
  AND token = 'yJd8SP5ludidZ+ygAfAcrkA1wG4dgci06C53rCXocN4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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