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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '42b2405ec82e257d780fab2f8eb537c44198fc6f3b46a9278c66e5482e858abb' 
  AND token = '0Sdao8mqdSmH2bFwtcLoQnv4fVt9WK5XVv7kyNOYOGs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00067

JSON explain

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