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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7478d425af22e3542b21567c3dc8e20a1ab089ba8a630ef5dd57f8cc934a0f89' 
  AND token = '93UVmpFjcpl8kChaKx4Fdv7UuveWPuS3OM5Xaf70D6w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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