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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '004b1cf81a3b085afc806cbd1398bcb5ea427930bed90af29bc77088193c8509' 
  AND token = 'k1Fo1cOiO51eSXgMM3gQlBBP66+ZC/0Jdt0p1SEtEiI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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