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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b5583c47bcc090bb82afe63971eaf1a6e670093b0531bc2e16511eb409c54148' 
  AND token = 'TFa5L1WzVNSRQXH7y6E3d/wZccuw63WkGl9V4jP1tE4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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