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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '739566d815b4ab20da3f625b6b0fd715d4322b0e980c1d09f66e3d44b827a332' 
  AND token = 'h0DokGwaUZ59Osl9mBlknD/02Qkp+YwEz1Bacj99P+E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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