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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bf6f74aa1a4e72857ed6436589eb5fd422a3b61f9e29b3d0c159d29be251fd3c' 
  AND token = 'gtrN+tYR9gjZEZgvNGu3lpYnnqGWvHTS0AWv5vfuj1E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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