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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e3f6f69aec28516bc79f82ec29ae6f59f3bee935baf2bf1045a0df582b43fe25' 
  AND token = 'oAOsCffZz8iVHlpptpPckSGuRmS50RlbQIoxI2eqjes=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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