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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f9c747ef59538d82dc61f56482427bce155df7365fe4f8e897be37452e62e416' 
  AND token = '80tRxgHheaHVGfbF4fInwAhgo8Lks0/8SanQPBxSh+s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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