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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c1ead020cb04688f53d15587956bc06d69cac5557382637a534623f0ee5b1ab3' 
  AND token = '6O81WqAzkzRRDMm2KYvqOSvADqCEl6moLamwnysu0g8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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