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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'be5fa73e52b506b874033d48ade858c95387e3f49e447b0b2eac3c9b4d3570a7' 
  AND token = '0ArrcEhfTTsbSe5duenVDdznY/IY6RzxdG0lMM/wq6Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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