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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f71fbb5f88d04ea205e87e1bcb44735655aed8517277dcee4f04197497577edd' 
  AND token = 'egDo48vo5D8vqVezVR3GrW+ZgttAhUkCciKnD4wXgv0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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