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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '348b0067e57ffbe3b7552a31f9adee71311359520cb232d558fc7121e044dbef' 
  AND token = 'w5X6pdnpcq1ClKSpGCEe7js54elqpuSH7DjbO+U1Rgc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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