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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e0ba71f3e9c9ec0dce74f53f2ce43c2d93617bd5b4a2b40ee09a1d0f589f2fba' 
  AND token = 'wwmVr1m/vHfgQuVheYiOIsZv+rYBBB8VpoIvBNychII=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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