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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b1d9457c89d10ff2ee62e1af9a1d6fe8f9fb3f4b3dbb157f0be4a5197b420298' 
  AND token = 'FJSkynk5/eAwDe4DjUrYdirQk3NU8Ks/Tiytoavc7jg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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