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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3c133863fd90c20e7fae462e000167e07c0287ba986387b4ccf23134ffc7999b' 
  AND token = 'yLH2YE8mba48GQlW3ThQYpk7JYPb/kAI0Q0UzQZbnC4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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