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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b1fade710aeb1544678e2dfba52bb8ac067fa3ad1b8a401b4a720b9c48320d7b' 
  AND token = '2oFYxLAM6rdnspyc9UUvMnZHGQFtaLsFKjn4wh3bfyM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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