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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e29080457d59a3d78c76d04b7fb5b73c4d6316f5fa0a9316c53a9f4eb4b89afb' 
  AND token = 'EvTH02zaT09skpHv0bHix3S7Zqv2tFJK+FBlhg4Ry6Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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