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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '481372a72cf8b0b1ed9f29acec172a6ba9f5bd956a36fa1f6be81bb5a34f1f32' 
  AND token = 'om5nc5FB+s7NTwhzq0VkNxVe1bBDN5ch46qizltkVUw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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