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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '54ed59faa3949b972a4f93ec9bcee10600aab1d571f2ad6e9c2983257626a533' 
  AND token = 'aFjO8ANcRGKz427q+yKl3pgM+9qto/N4GaoRrrYZpf0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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