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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '285b675c9f021b6dc23010d50857991dc7e5077436d89646b90259e4910c04aa' 
  AND token = 'whigAIXH0iG4VtENsDBA7Abt2rgbAPWJbnr6DbkVbIc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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