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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5928bad59081291e0840140b3dfea0d67a4e1cc4453ee0f1d0890279d674167e' 
  AND token = 'H7/945ELTYWPEVII9i+01n0WENGzK/Lgz1aB7ji735U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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