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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5bd63dda051a779a55a2155c3a5767b5856f932f8408455a3d177c742280cf63' 
  AND token = '/R1hJuJUKuOjcRdFFY0mmPSP31jgXwrXOqt5n95z1iA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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