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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5127f8a3f3d0ba81ec4ae38c025bec3473cc3d0be2a6870e4334796d3915659d' 
  AND token = 'dlacPi1lGPrntOlih2Av2DR+yNVhBCDccntPqHUUvCE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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