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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '264d7cbb8aab469a5a0c7ed7749fab929310f5b37b96ffc691f787c5b5222883' 
  AND token = '2Ol/EWp0PD8ub0K9WwMu4AC1dY7LFQ8+rDb5fJx/j+o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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