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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '148ec0549fa45544545d71146cdb3e1066715ed71a798391bbf9f3b85106c1ed' 
  AND token = 'RodR4PJKAQyenHvMVi3MAfmfuvGgJxtWexQHI+Mb070=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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