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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3c2cd1e14c10057bfaed6766020f2ef95e64756f0eca5219f1589b96f783739c' 
  AND token = 'tskwTQ/mVMUEpQSCA7rWeF+aEt87Kf+d7azhiLN0Jwc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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