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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '62801d1f64bfb2b21cd9c82caf352a0a4ad13c6c4e9bf9341d95abc0d3c827b4' 
  AND token = 'Mzv68Bpul/enjq3Cavi5AlkcTY6lAdpv8AaxP67EIFE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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