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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '92710896357b5433a432741179396aa0281d82d3f5db405b197ba975b41568b9' 
  AND token = 'H7hiJ7xJW4NbOYjrvQkR0tlgiVsJc6znyqT+3tAcKok=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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