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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e517d1d68f93ac0a93eabf108fbed170e23441f891dcac87b124f9ed749a1af6' 
  AND token = '4GLPsT4TamFjeMTdEeRSjW5vOzDvGVioc+Fo5jD3LKc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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