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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9689812c4839edb2c8ffb89c5d7a73177414057c39e92d078dc7ced25793e299' 
  AND token = 'LU+mdsKo93lUdIdxjcYI8vW+8Z89NhPumkHqoff+zLo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00053

JSON explain

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