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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd9a85f0be75fb2f172cf042d1b516b6a1e8732e91f1199ed2d5ed616994488a0' 
  AND token = '2SqHuY0nxkBxa0MuEUEu749gtoz9bzsqr7QqX746MG8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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