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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4805572040e4073d0805b2edb0de8056532d882c6b9f1e5b2a5211e07ca284f0' 
  AND token = 'KYWjbfV5qcaRSiB5A//JyqFPa9fzDWzw2IaSwI6cnLY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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