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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9fd2f20a6209b5cdb496244c78ed906662cb6bcb507a0b2a160f700d79d5f267' 
  AND token = 'agf7LsmwN7k46sGS/UrmUHx+Ppf7DuED2iVEZH1er7I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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