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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2841ce55136b48828c8f5983615de2d011d24271309feee3703a886c6c9d53bc' 
  AND token = '7VY8TNtMHIp12+0wWEU3alPgcNNXs/OGZiG0gIN14CY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

JSON explain

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