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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '88e2c2319f32443a4c404bc5d9b11ad7c9307bed02c4b1fac4307a8eead2a167' 
  AND token = 'C6amF5SJOQy4W/S0K4B8mleT15knglGDEAetg8J4lZc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00056

JSON explain

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