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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6b062c8fa3b54fe8369dc44984f77a4b79434a767ae115a4db61788bacd1c6b4' 
  AND token = '1GZezajo/UfNrB6XDbHSQiTy5yIokfvNJWJKazsxU5I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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