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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9e20dbd12e02270c8c786713337b7a7b68e9ff04b534e2de98912fe639ac89f9' 
  AND token = 'qlckF/8vCNEiYPS7In6s3PqENGbBFE7Z8y8h04jOaJQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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