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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '365954f2bdf41588dd468eb86d3898ae739ee9a7569cb329d9a89157310c1962' 
  AND token = 'upNgk/Gq6YkqPIzQh9TtcZx8/zyA9kr61U+gvyGm96Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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