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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '502a2b9761b0a8ba06f6d7ceb9fbf92e0d967f9b92b90e8316db3e32876aa18c' 
  AND token = 'LAPhNMx1GyD516XG19JNhq/kZf1+V6d1MzouFi2oj7M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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