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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '08de04934d998747b93c61ae598cd1ab3cc8f16788c2c69e4c12dd99ea08af45' 
  AND token = 'JQghB/D4YwgEdQ8a7rvlOwJ2r9GDU8jhm9YERvHH374=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00066

JSON explain

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