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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c9296b5ba92ff1c1963566e6b0bc098789afb08424e5cd0cb68aeda85f0e1449' 
  AND token = 'Vr6FED60rSh67B7T12o13fwjbQzN0ZWXFTrDq2ZBhVM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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