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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '474ea0d68537f04fd2cd5318f84a90f7d6440a72ef03bccbb0e67a48475eb572' 
  AND token = 'fEVTAWYP8ph/vgoXfWWzq5S2NfQsA813baUqNFYjnd4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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