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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '02e4bb7673095c6c595026b38c3223f5f4c138eb5ff3b64239310ec0fbe116e5' 
  AND token = 'AVDTO2TMA6hifl/eeB5qnUqxFZgwdB/OGMTxqwuF5sE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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