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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1ae6498404525cc5f2be4661b353ff1f54c07a7769a423674f002c131ea41fea' 
  AND token = '7vkhAA0pr+VRRlU2ucHRWa8Y/SDa5ge0lzz7XzESLks=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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