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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ea02203485d397e02cd3dc2d21c936f5f2d88dc2628b81b90178fe7366f64eec' 
  AND token = 'OUlpHEVP1I8NIlVoEpkAJS7EYuNTjTmfYOvf2axvLYI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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