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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '52de9088095a3f360ee2d1ee31596d1deccdcd92980f7551de77e88935b91546' 
  AND token = 'G8sRRKsSC1LRjGWf8Y9jg3p0eXuXbxQZEulD+ELOQ1w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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