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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '274c7e88ad3737504f2ee47d194c9d950b160507c6a25c04271355734f9d8fe0' 
  AND token = 'DVhgYVHiO7lde/Ovr+XYZYYLs85UIEOhePAAhW43af0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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