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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f3b2075406e0d413ea6f5445968c0fd8cc8666952717eb9f7d69d262bffce42d' 
  AND token = 'qK5sp1ySd9zGOxzvSmRFs2XyqemzWZIp6cCGM7hCoO0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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