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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ba5fdcf393626c8176557cf4e7625f59442e65a738ea58dec4e1667418089e69' 
  AND token = 'HDvakkscS404dH+HDaDjQUryaX1Ele4Qev7fHO6s5Y4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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