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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ff715c8f0870dc5df4d2fdb42f1924d1ca1533a85238c20740354182db166d2d' 
  AND token = 'fx5rVhQZZNZkT1nV2r2snT5OnKZyf0T6GlA4KjjQgBk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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