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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8a1b569f471e902f1ef225f447a5db0ad35c5e90947d1eb52499049f20f0cb60' 
  AND token = 'o5frjo1MoFi3n2poKHt/85ErRLmSDZvRFufCxNFq9ek=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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