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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '91e11800afd3358a2fb0154c3c141936540cb3701a42342c2566532d5b6753fe' 
  AND token = 'VGTvgbtWB4RwPdvysBYJ8DCCPqp4y4C3KS6O43EI5eg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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