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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c6911b463639dd24f55660a3ffcffd4a0adcd42e18b1b0965c8790d3d0c8a7a2' 
  AND token = '+KOuLtBzyurV9iAUtLb6pumbwcNc0dYwp5qQOXF2t7g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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